RESUMO
Numerous investigations have been carried out on the spectral distribution of the light of different species of fireflies. Here we record the emission spectrum of the Indian species of the firefly Luciola praeusta Kiesenwetter 1874 (Coleoptera : Lampyridae : Luciolinae) on a color film. Green and red color-sectors, with an intense yellow one in between, appear in this spectrum. Intensity profile of this spectrum reveals a hitherto undetected strong narrow yellow line, which lies within the full-width-at-half maximum (FWHM) of the intensity profile. The spectrum recorded in a high-resolution spectrometer confirms the presence of this sharp intense line. This finding lends support to an earlier drawn analogy between the in vivo emission of the firefly and laser light.
Assuntos
Vaga-Lumes , Medições Luminescentes , Animais , Cor , MasculinoRESUMO
We recorded the in vivo emission and time-resolved spectra of the firefly Luciola praeusta Kiesenwetter 1874 (Coleoptera : Lampyridae : Luciolinae). The emission spectrum shows that the full width at half maximum (FWHM) value for this particular species is 55 nm, which is significantly narrower than the in vivo half-widths reported till now. The time-resolved spectrum reveals that a flash of about 100 ms duration is, in fact, composed of a number of microsecond pulses. This suggests that the speed of the enzyme-catalysed chemiluminescence reaction in the firefly for the emission of light is much faster than was previously believed.
Assuntos
Besouros/metabolismo , Luminescência , Trifosfato de Adenosina/química , Animais , Catálise , Besouros/genética , Enzimas/química , Luciferina de Vaga-Lumes/química , Luz , Modelos Genéticos , Oscilometria/métodos , Oxigênio/química , Espectrofotometria/métodos , Fatores de TempoRESUMO
In addition to their use as food and spice, chillies have been popular in both Ayurvedic and homoeopathic treatments since ancient times. Elemental analyses on their seeds with the help of X-ray fluorescence spectra reveal the presence of hitherto undetected magnesium, along with sulphur and chlorine. Fourier transform infrared and Fourier transform Raman spectra of the seeds reveal the presence of specific functional groups, attributed to the different bands present in the spectra. Ascorbic acid, reported to be the vitamin present in maximum amount in chilli peppers, is conspicuous by its absence in the seeds.
Assuntos
Capsicum/química , Sementes/química , Análise Espectral , Oligoelementos/químicaRESUMO
In this work, emission and Fourier transform infrared spectra of the jackfruit seed, in powdered form, are recorded. Analysis of the emission spectrum confirms the presence of two hitherto undetected elements, manganese and magnesium. The Fourier transform infrared spectrum reveals the presence of some specific functional groups, attributed to the different bands present in the spectrum.
